Final Review #3: Balancing Chemical Equations

Front

What is a Chemical Equation?

Back

A representation of a chemical reaction.

Front

Which equation is balanced?

Back

2Na + 2H₂O → 2NaOH + H₂.

Front

What are the coefficients that would properly balance this equation? __AgNO₃ + __H₂S → __Ag₂S + __HNO₃

Back

2,1 → 1,2.

Front

What is the little number after an element in a chemical equation called? Example: H₂

Back

Subscript.

Front

What is the total number of atoms present in 5Na₃PO₄?

Back

40.

Front

What is a Coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or atoms are involved in the reaction.

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the Law of Conservation of Mass?

Back

Matter cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

What is a Reactant?

Back

A substance that takes part in and undergoes change during a reaction.

Front

What is a Product in a chemical reaction?

Back

The substances that are formed as a result of a chemical reaction.